Thanks for the reply 
So, one by one:
- yes its in lightmass importance vol.
- materialroughness is set to 0.86
- I tried, even the passes, it seems to be a GI issue, only disappears when i turn off GI
- most likely caused by indirect skylight (existing spot lights doesnt make the issue go away even if i deleted them from the scene
However, by moving the couch a bit away from the wall seems to lighten the white areas, but this is not really a problem solving as in this case its fine, i did it for demoing purposes, but if a client wants something by a wall, and this reappears as an issue, I dont know how to fix it for good.
Any more ideas?